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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b1cd44fd50afce3942d739c20bc53e9af3f717e06af2e4992d1f9ff6e33fc19' 
  AND token = 'oPfDFAuz5IAHILRzstWTysgJQpzDYh3duGs/JTS4ytQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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