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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fea09e37f697a45d2c800e4afc52670b5a8046c3050bdee5397ea93ecc8581be' 
  AND token = '+O124PiTNelNLH8B8cHIAGJ4oyH6rINRb3/RtknJBsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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