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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '565554e850951bbf871b28ef2881e596e921d593c4ada80c321f2157a3fb60db' 
  AND token = 'nWZHeFYUX7lIfekgff4/ke+8M6VvZISz9pkbyRaRJf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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