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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e74ac129cc58dd0fd596e60962b46b24416afabe5c6cf3e4ead4c0da0d376003' 
  AND token = '5xlkROUyNXE8rjm1te7/zy3O/4d9Vclhm2isqd2dk3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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