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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2feb4ef6dfdd7d2eb7407188269a1bda2c8a0860f971d044d839efc30c39c087' 
  AND token = '79neY0xWUvRj8dwjch2IgOrf+p+TlhvNW3ltoqgnnXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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