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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '431bb5083bbe30c88a1568a3865b1f1f5107759ebcdc4b858c73147bc35a2fd7' 
  AND token = 'zq6vzadAg/HbUx47r+BZ8+eX8Di0tplzUH0oDpscF+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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