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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '88072be06e17d42b7adaa1c069632ba276768477a6cde9977df976140878a1f5' 
  AND token = 'r4P10MiUbpaGU5ij/RXa7lzKLfIxLC9nwcY3N19lulY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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