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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3619d8a8dd33142f97548debcaa442b82bc82e71b1bdb0cd71862e0db6027b78' 
  AND token = 'ceuw8Jnb4XXiyPSNfsIGRKFKW/tUoIKJBoYlA/mt1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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