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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ca67330c5c83df19f785bf67ae05ed2de4fd977f3dbd6e6604a357e4605d134' 
  AND token = 'Lm1F7Zx25Z19uKAsEm7qNKUzKN9DQqk9kaoBfhvXMhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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