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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5165c0ef22f144d82de6c52b4be7e91026b3e63dc20f73eb160cad4e6f2d1ef5' 
  AND token = 'ZlpYcpWXrI8JOooBziDPkmi/Akbwgaie5kItOZQg2fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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