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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5d14e25cd07e153a920b2a8269ed8b00b3a1870e4daa621ae35c6e4fb9af3f8' 
  AND token = 'X7E+GcbJkPNpXfoXQO02058l+9a8m89bO2/Y/isn2ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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