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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3510d0a3c11875067a1de48b1344df9e456858d85a9536d438f968b51e14165' 
  AND token = '4uV/M0hqJpDT1DK1GO/RAPz3JHEhS/d8fpaknoIk4EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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