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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '405bd2f1bea6ff2e9638b7e6345102f700001f4dacdef79b5f27d5bb1e6c7c70' 
  AND token = 'xtI34Ges5szlu8o9P8vEGX2YjN/U0le9Cg5zvUOYljM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}