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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c19da42dc208598dbac1f777031ed1d4ef5df9a73ed3d2a2535bf26cb2ac0eed' 
  AND token = 'fAC2vDjwVOw4uft05hc8BGXbgeTpEFjdjcmDS+58maE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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